Remove more deprecated methods, fields, and exports

[t3chguy]

Requires https://github.com/matrix-org/matrix-react-sdk/pull/12555

• Removes legacy overload of EventTimelineSet::addLiveEvent
• Removes legacy overload of EventTimeline::addEvent
• Removes legacy overload of Room::addLiveEvents
• Removes backwards compatible export of CryptoApi, use Crypto.CryptoApi instead
• Removes backwards compatible export of DeviceVerificationStatus, use Crypto.DeviceVerificationStatus instead
• Removes Autodiscovery.ERROR_HOMESERVER_TOO_OLD, use Autodiscovery.ERROR_UNSUPPORTED_HOMESERVER_SPEC_VERSION instead
• Removes registration request body fields x_show_msisdn, bind_msisdn, bind_email. These were unspecced and unsupported for a long time.
• Removes long deprecated event fields age, prev_content, these now live in unsigned
• Removes long deprecated event field user_id, this is now sender
• Remove Room::lastThread in favour of Room::getLastThread()
• Remove Room::hasUnverifiedDevices. Instead, call Room::getEncryptionTargetMembers, CryptoApi::getUserDeviceInfo, and CryptoApi::getDeviceVerificationStatus

[t3chguy]

Marking as release blocker to bundle with the other breaking changes